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-33 =a(1-(-2)^5) / 1-2
-33 =a(1-(-32)) / -1
-33 =a(1+32) / -1
-33 =a(33) / -1
-33/-1 =33a
33 =33a
1 =a
U3 + U4
=a.r^3-1 + a.r^4-1
=ar^2 + ar^3
=1.(-2)^2 + 1.(-2)^3
=1.4 + 1. -8
=4+(-8)
= -4
maap klo slah